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OpenTelemetry","\u002Fcompare\u002Fopentelemetry","8.compare\u002F2.opentelemetry",{"title":591,"path":592,"stem":593,"icon":567},"evlog vs LogTape","\u002Fcompare\u002Flogtape","8.compare\u002F3.logtape",{"title":595,"path":596,"stem":597,"icon":567},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","8.compare\u002F4.winston",{"title":599,"path":600,"stem":601,"icon":567},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","8.compare\u002F5.consola",{"id":603,"title":411,"body":604,"description":1144,"extension":1145,"links":1146,"meta":1151,"navigation":1152,"path":412,"seo":1153,"stem":413,"__hash__":1154},"docs\u002F5.use-cases\u002F4.audit\u002F05.compliance.md",{"type":605,"value":606,"toc":1137},"minimark",[607,620,625,628,741,764,773,777,784,895,939,943,946,959,972,976,979,1038,1041,1045,1133],[608,609,610,611,615,616,619],"p",{},"Compliance frameworks (SOC2, HIPAA, GDPR, PCI) ask the same five questions of every audit log: ",[612,613,614],"strong",{},"who, what, when, from where, with which outcome",", plus ",[612,617,618],{},"how do we know it wasn't tampered with",". evlog answers each one through composition of the existing primitives.",[621,622,624],"h2",{"id":623},"integrity","Integrity",[608,626,627],{},"Hash-chain the audit log so any tampering is detectable. Each event's hash includes the previous hash, so deleting a row breaks the chain forward of that point.",[629,630,635],"pre",{"className":631,"code":632,"language":633,"meta":634,"style":634},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","auditOnly(\n  signed(createFsDrain({ dir: '.audit' }), { strategy: 'hash-chain' }),\n  { await: true },\n)\n","typescript","",[636,637,638,651,717,735],"code",{"__ignoreMap":634},[639,640,643,647],"span",{"class":641,"line":642},"line",1,[639,644,646],{"class":645},"s2Zo4","auditOnly",[639,648,650],{"class":649},"sTEyZ","(\n",[639,652,654,657,660,663,665,669,673,676,679,683,686,689,692,695,698,701,703,705,708,710,712,714],{"class":641,"line":653},2,[639,655,656],{"class":645},"  signed",[639,658,659],{"class":649},"(",[639,661,662],{"class":645},"createFsDrain",[639,664,659],{"class":649},[639,666,668],{"class":667},"sMK4o","{",[639,670,672],{"class":671},"swJcz"," dir",[639,674,675],{"class":667},":",[639,677,678],{"class":667}," '",[639,680,682],{"class":681},"sfazB",".audit",[639,684,685],{"class":667},"'",[639,687,688],{"class":667}," }",[639,690,691],{"class":649},")",[639,693,694],{"class":667},",",[639,696,697],{"class":667}," {",[639,699,700],{"class":671}," strategy",[639,702,675],{"class":667},[639,704,678],{"class":667},[639,706,707],{"class":681},"hash-chain",[639,709,685],{"class":667},[639,711,688],{"class":667},[639,713,691],{"class":649},[639,715,716],{"class":667},",\n",[639,718,720,723,726,728,732],{"class":641,"line":719},3,[639,721,722],{"class":667},"  {",[639,724,725],{"class":671}," await",[639,727,675],{"class":667},[639,729,731],{"class":730},"sfNiH"," true",[639,733,734],{"class":667}," },\n",[639,736,738],{"class":641,"line":737},4,[639,739,740],{"class":649},")\n",[742,743,744,751,752,755,756,759,760,763],"warning",{},[612,745,746,747,750],{},"Rotate ",[636,748,749],{},"secret"," for HMAC-signed audits annually."," When you rotate, embed a key id alongside the signature (e.g. extend ",[636,753,754],{},"AuditFields"," with ",[636,757,758],{},"keyId"," via ",[636,761,762],{},"declare module",") so old events stay verifiable against the previous secret. Verifiers should look up the key by id, not assume a single global secret.",[608,765,766,767,772],{},"See ",[768,769,771],"a",{"href":770},"\u002Fuse-cases\u002Faudit\u002Fpipeline#signed","Drains & Integrity"," for the difference between HMAC and hash-chain.",[621,774,776],{"id":775},"redact","Redact",[608,778,779,780,783],{},"Audit events run through your existing ",[636,781,782],{},"RedactConfig",". Compose with the strict audit preset to harden PII handling:",[629,785,787],{"className":631,"code":786,"language":633,"meta":634,"style":634},"import { auditRedactPreset } from 'evlog'\n\ninitLogger({\n  redact: {\n    paths: [\n      ...(auditRedactPreset.paths ?? []),\n    ],\n  },\n})\n",[636,788,789,813,819,829,839,850,873,881,887],{"__ignoreMap":634},[639,790,791,795,797,800,802,805,807,810],{"class":641,"line":642},[639,792,794],{"class":793},"s7zQu","import",[639,796,697],{"class":667},[639,798,799],{"class":649}," auditRedactPreset",[639,801,688],{"class":667},[639,803,804],{"class":793}," from",[639,806,678],{"class":667},[639,808,809],{"class":681},"evlog",[639,811,812],{"class":667},"'\n",[639,814,815],{"class":641,"line":653},[639,816,818],{"emptyLinePlaceholder":817},true,"\n",[639,820,821,824,826],{"class":641,"line":719},[639,822,823],{"class":645},"initLogger",[639,825,659],{"class":649},[639,827,828],{"class":667},"{\n",[639,830,831,834,836],{"class":641,"line":737},[639,832,833],{"class":671},"  redact",[639,835,675],{"class":667},[639,837,838],{"class":667}," {\n",[639,840,842,845,847],{"class":641,"line":841},5,[639,843,844],{"class":671},"    paths",[639,846,675],{"class":667},[639,848,849],{"class":649}," [\n",[639,851,853,856,859,862,865,868,871],{"class":641,"line":852},6,[639,854,855],{"class":667},"      ...",[639,857,858],{"class":649},"(auditRedactPreset",[639,860,861],{"class":667},".",[639,863,864],{"class":649},"paths ",[639,866,867],{"class":667},"??",[639,869,870],{"class":649}," [])",[639,872,716],{"class":667},[639,874,876,879],{"class":641,"line":875},7,[639,877,878],{"class":649},"    ]",[639,880,716],{"class":667},[639,882,884],{"class":641,"line":883},8,[639,885,886],{"class":667},"  },\n",[639,888,890,893],{"class":641,"line":889},9,[639,891,892],{"class":667},"}",[639,894,740],{"class":649},[608,896,897,898,901,902,901,905,908,909,901,912,901,915,901,918,901,921,901,924,927,928,931,932,935,936,861],{},"The preset redacts ",[636,899,900],{},"authorization",", ",[636,903,904],{},"cookie",[636,906,907],{},"set-cookie",", and common credential key names (",[636,910,911],{},"password",[636,913,914],{},"token",[636,916,917],{},"apiKey",[636,919,920],{},"cardNumber",[636,922,923],{},"cvv",[636,925,926],{},"ssn",") ",[612,929,930],{},"at any nesting depth",", including inside ",[636,933,934],{},"audit.changes.before"," \u002F ",[636,937,938],{},"audit.changes.after",[621,940,942],{"id":941},"gdpr-vs-append-only","GDPR vs append-only",[608,944,945],{},"Append-only audit logs collide with GDPR's right to be forgotten. Recommended pattern today:",[947,948,949,953,956],"ol",{},[950,951,952],"li",{},"Keep audit rows immutable.",[950,954,955],{},"Encrypt PII fields with a per-actor key (held outside the audit store).",[950,957,958],{},"To \"forget\" a user, delete their key. The audit row stays, the chain stays valid, the PII becomes unreadable.",[608,960,961,962,965,966,861],{},"A built-in ",[636,963,964],{},"cryptoShredding"," helper is on the ",[768,967,971],{"href":968,"rel":969},"https:\u002F\u002Fgithub.com\u002Fevloghq\u002Fevlog\u002Fissues",[970],"nofollow","follow-up roadmap",[621,973,975],{"id":974},"retention","Retention",[608,977,978],{},"Retention is a storage-layer concern by design. evlog's audit layer doesn't enforce retention windows because every supported drain already has a stronger, audited mechanism for it. Pick the one matching your drain:",[980,981,982,995],"table",{},[983,984,985],"thead",{},[986,987,988,992],"tr",{},[989,990,991],"th",{},"Drain",[989,993,994],{},"Retention mechanism",[996,997,998,1011,1022,1030],"tbody",{},[986,999,1000,1004],{},[1001,1002,1003],"td",{},"FS",[1001,1005,1006,1007,1010],{},"Combine ",[636,1008,1009],{},"createFsDrain({ maxFiles })"," with a daily compactor.",[986,1012,1013,1016],{},[1001,1014,1015],{},"Postgres",[1001,1017,1018,1019,861],{},"Schedule ",[636,1020,1021],{},"DELETE FROM audit_events WHERE timestamp \u003C now() - interval '7 years'",[986,1023,1024,1027],{},[1001,1025,1026],{},"Axiom \u002F Datadog \u002F Loki",[1001,1028,1029],{},"Set the dataset retention policy in the platform.",[986,1031,1032,1035],{},[1001,1033,1034],{},"S3 Object Lock",[1001,1036,1037],{},"Configure lifecycle rules + Object Lock retention period.",[608,1039,1040],{},"Document the chosen window in your security policy. Auditors care about the written rule, not the enforcing component.",[621,1042,1044],{"id":1043},"common-pitfalls","Common Pitfalls",[1046,1047,1048,1061,1084,1090,1109,1123],"ul",{},[950,1049,1050,1053,1054,755,1057,1060],{},[612,1051,1052],{},"Logging only successes."," Auditors care most about denials. Always pair ",[636,1055,1056],{},"log.audit()",[636,1058,1059],{},"log.audit.deny()"," on the negative branch of every authorisation check.",[950,1062,1063,1069,1070,1073,1074,1076,1077,901,1079,901,1081,1083],{},[612,1064,1065,1066,861],{},"Leaking PII through ",[636,1067,1068],{},"changes"," ",[636,1071,1072],{},"auditDiff()"," runs through your ",[636,1075,782],{},", but only if the field paths are listed. Add ",[636,1078,911],{},[636,1080,914],{},[636,1082,917],{},", etc. once globally so you never have to think about it again.",[950,1085,1086,1089],{},[612,1087,1088],{},"Treating audits as observability."," Don't sample, downsample, or summarise audit events. Force-keep is on by default. Do not disable it.",[950,1091,1092,1069,1099,1101,1102,935,1105,1108],{},[612,1093,1094,1095,1098],{},"Conflating ",[636,1096,1097],{},"actor.id"," with the session id.",[636,1100,1097],{}," is the stable user id (or system identity). Correlate sessions via ",[636,1103,1104],{},"context.requestId",[636,1106,1107],{},"context.traceId",", never via the actor.",[950,1110,1111,1114,1115,1118,1119,1122],{},[612,1112,1113],{},"Forgetting standalone jobs."," Cron tasks, queue workers, and CLIs trigger audit-worthy actions too. Use ",[636,1116,1117],{},"audit()"," (no request) or ",[636,1120,1121],{},"withAudit()"," to keep coverage parity with your HTTP routes.",[950,1124,1125,1132],{},[612,1126,1127,1128,1131],{},"Skipping ",[636,1129,1130],{},"await: true"," on the audit drain."," Without it, audits are fire-and-forget. A crash between the event being emitted and the drain flushing means the action happened but no audit row exists.",[1134,1135,1136],"style",{},"html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .sfNiH, html code.shiki .sfNiH{--shiki-light:#FF5370;--shiki-default:#FF9CAC;--shiki-dark:#FF9CAC}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}",{"title":634,"searchDepth":653,"depth":653,"links":1138},[1139,1140,1141,1142,1143],{"id":623,"depth":653,"text":624},{"id":775,"depth":653,"text":776},{"id":941,"depth":653,"text":942},{"id":974,"depth":653,"text":975},{"id":1043,"depth":653,"text":1044},"Integrity, redact presets, GDPR vs append-only, retention windows, and the most common pitfalls when shipping audit logs to production.","md",[1147,1150],{"label":771,"icon":409,"to":407,"color":1148,"variant":1149},"neutral","subtle",{"label":415,"icon":84,"to":416,"color":1148,"variant":1149},{},{"title":411,"icon":388},{"title":411,"description":1144},"eaty2Zo1S4rASyAl6Gj6gIQlclu1msskU-4fakBhs0c",[1156,1158],{"title":406,"path":407,"stem":408,"description":1157,"icon":409,"children":-1},"auditEnricher to auto-fill request context, auditOnly to route audits to a dedicated sink, and signed for tamper-evident HMAC or hash-chain integrity.",{"title":415,"path":416,"stem":417,"description":1159,"icon":84,"children":-1},"File system, Axiom, and Postgres recipes for audit logs, plus mockAudit for tests and the full API reference.",1791059994075]